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choelzl
2022-04-07 18:46:57 +02:00
parent 88cb3426ad
commit 15e7120d6d
5316 changed files with 4563444 additions and 6 deletions
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9
cs440-acg/ext/eigen/demos/mix_eigen_and_c/README Normal file
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This is an example of how one can wrap some of Eigen into a C library.
To try this with GCC, do:
g++ -c binary_library.cpp -O2 -msse2 -I ../..
gcc example.c binary_library.o -o example -lstdc++
./example
TODO: add CMakeLists, add more explanations here

185
cs440-acg/ext/eigen/demos/mix_eigen_and_c/binary_library.cpp Normal file
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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This C++ file compiles to binary code that can be linked to by your C program,
// thanks to the extern "C" syntax used in the declarations in binary_library.h.
#include "binary_library.h"
#include <Eigen/Core>
using namespace Eigen;
/************************* pointer conversion methods **********************************************/
////// class MatrixXd //////
inline MatrixXd& c_to_eigen(C_MatrixXd* ptr)
{
return *reinterpret_cast<MatrixXd*>(ptr);
}
inline const MatrixXd& c_to_eigen(const C_MatrixXd* ptr)
{
return *reinterpret_cast<const MatrixXd*>(ptr);
}
inline C_MatrixXd* eigen_to_c(MatrixXd& ref)
{
return reinterpret_cast<C_MatrixXd*>(&ref);
}
inline const C_MatrixXd* eigen_to_c(const MatrixXd& ref)
{
return reinterpret_cast<const C_MatrixXd*>(&ref);
}
////// class Map<MatrixXd> //////
inline Map<MatrixXd>& c_to_eigen(C_Map_MatrixXd* ptr)
{
return *reinterpret_cast<Map<MatrixXd>*>(ptr);
}
inline const Map<MatrixXd>& c_to_eigen(const C_Map_MatrixXd* ptr)
{
return *reinterpret_cast<const Map<MatrixXd>*>(ptr);
}
inline C_Map_MatrixXd* eigen_to_c(Map<MatrixXd>& ref)
{
return reinterpret_cast<C_Map_MatrixXd*>(&ref);
}
inline const C_Map_MatrixXd* eigen_to_c(const Map<MatrixXd>& ref)
{
return reinterpret_cast<const C_Map_MatrixXd*>(&ref);
}
/************************* implementation of classes **********************************************/
////// class MatrixXd //////
C_MatrixXd* MatrixXd_new(int rows, int cols)
{
return eigen_to_c(*new MatrixXd(rows,cols));
}
void MatrixXd_delete(C_MatrixXd *m)
{
delete &c_to_eigen(m);
}
double* MatrixXd_data(C_MatrixXd *m)
{
return c_to_eigen(m).data();
}
void MatrixXd_set_zero(C_MatrixXd *m)
{
c_to_eigen(m).setZero();
}
void MatrixXd_resize(C_MatrixXd *m, int rows, int cols)
{
c_to_eigen(m).resize(rows,cols);
}
void MatrixXd_copy(C_MatrixXd *dst, const C_MatrixXd *src)
{
c_to_eigen(dst) = c_to_eigen(src);
}
void MatrixXd_copy_map(C_MatrixXd *dst, const C_Map_MatrixXd *src)
{
c_to_eigen(dst) = c_to_eigen(src);
}
void MatrixXd_set_coeff(C_MatrixXd *m, int i, int j, double coeff)
{
c_to_eigen(m)(i,j) = coeff;
}
double MatrixXd_get_coeff(const C_MatrixXd *m, int i, int j)
{
return c_to_eigen(m)(i,j);
}
void MatrixXd_print(const C_MatrixXd *m)
{
std::cout << c_to_eigen(m) << std::endl;
}
void MatrixXd_multiply(const C_MatrixXd *m1, const C_MatrixXd *m2, C_MatrixXd *result)
{
c_to_eigen(result) = c_to_eigen(m1) * c_to_eigen(m2);
}
void MatrixXd_add(const C_MatrixXd *m1, const C_MatrixXd *m2, C_MatrixXd *result)
{
c_to_eigen(result) = c_to_eigen(m1) + c_to_eigen(m2);
}
////// class Map_MatrixXd //////
C_Map_MatrixXd* Map_MatrixXd_new(double *array, int rows, int cols)
{
return eigen_to_c(*new Map<MatrixXd>(array,rows,cols));
}
void Map_MatrixXd_delete(C_Map_MatrixXd *m)
{
delete &c_to_eigen(m);
}
void Map_MatrixXd_set_zero(C_Map_MatrixXd *m)
{
c_to_eigen(m).setZero();
}
void Map_MatrixXd_copy(C_Map_MatrixXd *dst, const C_Map_MatrixXd *src)
{
c_to_eigen(dst) = c_to_eigen(src);
}
void Map_MatrixXd_copy_matrix(C_Map_MatrixXd *dst, const C_MatrixXd *src)
{
c_to_eigen(dst) = c_to_eigen(src);
}
void Map_MatrixXd_set_coeff(C_Map_MatrixXd *m, int i, int j, double coeff)
{
c_to_eigen(m)(i,j) = coeff;
}
double Map_MatrixXd_get_coeff(const C_Map_MatrixXd *m, int i, int j)
{
return c_to_eigen(m)(i,j);
}
void Map_MatrixXd_print(const C_Map_MatrixXd *m)
{
std::cout << c_to_eigen(m) << std::endl;
}
void Map_MatrixXd_multiply(const C_Map_MatrixXd *m1, const C_Map_MatrixXd *m2, C_Map_MatrixXd *result)
{
c_to_eigen(result) = c_to_eigen(m1) * c_to_eigen(m2);
}
void Map_MatrixXd_add(const C_Map_MatrixXd *m1, const C_Map_MatrixXd *m2, C_Map_MatrixXd *result)
{
c_to_eigen(result) = c_to_eigen(m1) + c_to_eigen(m2);
}

71
cs440-acg/ext/eigen/demos/mix_eigen_and_c/binary_library.h Normal file
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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This is a pure C header, no C++ here.
// The functions declared here will be implemented in C++ but
// we don't have to know, because thanks to the extern "C" syntax,
// they will be compiled to C object code.
#ifdef __cplusplus
extern "C"
{
#endif
// just dummy empty structs to give different pointer types,
// instead of using void* which would be type unsafe
struct C_MatrixXd {};
struct C_Map_MatrixXd {};
// the C_MatrixXd class, wraps some of the functionality
// of Eigen::MatrixXd.
struct C_MatrixXd* MatrixXd_new(int rows, int cols);
void MatrixXd_delete (struct C_MatrixXd *m);
double* MatrixXd_data (struct C_MatrixXd *m);
void MatrixXd_set_zero (struct C_MatrixXd *m);
void MatrixXd_resize (struct C_MatrixXd *m, int rows, int cols);
void MatrixXd_copy (struct C_MatrixXd *dst,
const struct C_MatrixXd *src);
void MatrixXd_copy_map (struct C_MatrixXd *dst,
const struct C_Map_MatrixXd *src);
void MatrixXd_set_coeff (struct C_MatrixXd *m,
int i, int j, double coeff);
double MatrixXd_get_coeff (const struct C_MatrixXd *m,
int i, int j);
void MatrixXd_print (const struct C_MatrixXd *m);
void MatrixXd_add (const struct C_MatrixXd *m1,
const struct C_MatrixXd *m2,
struct C_MatrixXd *result);
void MatrixXd_multiply (const struct C_MatrixXd *m1,
const struct C_MatrixXd *m2,
struct C_MatrixXd *result);
// the C_Map_MatrixXd class, wraps some of the functionality
// of Eigen::Map<MatrixXd>
struct C_Map_MatrixXd* Map_MatrixXd_new(double *array, int rows, int cols);
void Map_MatrixXd_delete (struct C_Map_MatrixXd *m);
void Map_MatrixXd_set_zero (struct C_Map_MatrixXd *m);
void Map_MatrixXd_copy (struct C_Map_MatrixXd *dst,
const struct C_Map_MatrixXd *src);
void Map_MatrixXd_copy_matrix(struct C_Map_MatrixXd *dst,
const struct C_MatrixXd *src);
void Map_MatrixXd_set_coeff (struct C_Map_MatrixXd *m,
int i, int j, double coeff);
double Map_MatrixXd_get_coeff (const struct C_Map_MatrixXd *m,
int i, int j);
void Map_MatrixXd_print (const struct C_Map_MatrixXd *m);
void Map_MatrixXd_add (const struct C_Map_MatrixXd *m1,
const struct C_Map_MatrixXd *m2,
struct C_Map_MatrixXd *result);
void Map_MatrixXd_multiply (const struct C_Map_MatrixXd *m1,
const struct C_Map_MatrixXd *m2,
struct C_Map_MatrixXd *result);
#ifdef __cplusplus
} // end extern "C"
#endif

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cs440-acg/ext/eigen/demos/mix_eigen_and_c/example.c Normal file
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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include "binary_library.h"
#include "stdio.h"
void demo_MatrixXd()
{
struct C_MatrixXd *matrix1, *matrix2, *result;
printf("*** demo_MatrixXd ***\n");
matrix1 = MatrixXd_new(3, 3);
MatrixXd_set_zero(matrix1);
MatrixXd_set_coeff(matrix1, 0, 1, 2.5);
MatrixXd_set_coeff(matrix1, 1, 0, 1.4);
printf("Here is matrix1:\n");
MatrixXd_print(matrix1);
matrix2 = MatrixXd_new(3, 3);
MatrixXd_multiply(matrix1, matrix1, matrix2);
printf("Here is matrix1*matrix1:\n");
MatrixXd_print(matrix2);
MatrixXd_delete(matrix1);
MatrixXd_delete(matrix2);
}
// this helper function takes a plain C array and prints it in one line
void print_array(double *array, int n)
{
struct C_Map_MatrixXd *m = Map_MatrixXd_new(array, 1, n);
Map_MatrixXd_print(m);
Map_MatrixXd_delete(m);
}
void demo_Map_MatrixXd()
{
struct C_Map_MatrixXd *map;
double array[5];
int i;
printf("*** demo_Map_MatrixXd ***\n");
for(i = 0; i < 5; ++i) array[i] = i;
printf("Initially, the array is:\n");
print_array(array, 5);
map = Map_MatrixXd_new(array, 5, 1);
Map_MatrixXd_add(map, map, map);
Map_MatrixXd_delete(map);
printf("Now the array is:\n");
print_array(array, 5);
}
int main()
{
demo_MatrixXd();
demo_Map_MatrixXd();
}